Fluid-pressure adjusting mechanism.



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C. M. MANLY. FLUID PRESSURE ADJUSTING MEGHANISM.

APPLIGATION FILED AUG. 20, 1902.

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C. M. MANLY. FLUID PRESSURE ADJUSTING MEGHANISM.

APPLICATION FILED AUG. 20, 1902.

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UNITED STATES PATENT OFFICE.

FLUID-PRESSURE ADJUSTING NIECHANISNI.

Specification of Letters Patent.

Patented Oct. 3, 1905.

Application iiled August 20,1902. Serial. No. 120,415.

To /lf/l ill/wm, it ntfty 0077106771,.-

Be it known that I, CHARLES MATTHEWS MANLY, a citizen of the United States, and a resident of IVashington, District of Columbia, have invented certain new and useful Improvements in Fluid-Pressure Adjusting Mechanisms, of which the following is a specification..

My invention relates to a pressure-operated synchronous adjusting mechanism in which a fluid-pressure motor controlled by a valvevis interposed between a source of iiuid-pressure supply and a mechanism requiring rather powerful and frequent adjustments.

My object is to provide simple and effective means in such mechanism as that designated for adjusting at will relatively fixed elements of' a mechanism on which considerable forces may be acting' by the simple movement of a controlling-valve requiringja practically negligible force for its operation.

My further object is to accomplish this desirable result in such a way that the relatively fixed elements on which the considerable force may be acting will be adjusted at all times and in either direction in proportion to the movement of the controlling-valve and that such elements when so adjusted will remain fixed against extraneous forces tending to change their adjustment until their positions are changed by the movement of the controllingvalve, and, finally, my object is to provide such an adjusting mechanism that the pressure-operated motor which adjusts the relatively iixed elements of any mechanism which it is desired to adjust will make such adjustments practically simultaneously and synchronously with the adjustments or movements of the controlling-valve.

IVith these objects in view my invention consists in the combination, with a variablespeed gear comprising a pump and motor, of a duid-pressure adjusting-motor and connections between said motor and variable-speed gear whereby the said gear may be adjusted for different speeds, and, further, in the combination, with such a variable-speed gear, of a fluid-pressure adjusting-motor and a valve mechanism, one element of which is adjustable at will and another element of which is connected to said adjusting-motor, one of which elements is provided with a fixed part normally out of operative connection with, but adapted to be connected to, such other element; and my invention further consists in the novel construction and details thereof, as hereinafter described with reference to the accompanying drawings and more particularly pointed out in the claims.

In the drawings, which illustrate a preferred form in which my invention may be carried out, I have shown the adjusting mechanism as used in connection with a variable-speed gear, such as described and claimed in my Letters Patent No. 710,485, dated October 7, 1902.

Figure l is a side elevation of my adjusting mechanism applied to a variable-speed gear with the front half' of the relief-chamber thereof removed to show the Huid-pressure connection between the speed-gear and the adjusting-motor. Fig. 2 is a sectional plan view on the line 2 2, Fig. l, looking in the direction of the arrow. Fig. 3 is a sectional end View of the adjusting mechanism on the line 3 3, Fig. l, looking in the direction of the arrow. Fig. L is a detached side elevation of the secondary valve. Fig. 5 is an end elevation thereof looking in the direction of the arrow, Fig. 4. Fig. 6 is an end elevation of the primary regulating or controlling valve looking in the direction of the arrow in Fig. 3. Fig. 7 is a sectional plan view of the distributing-valve and relief-chamber of the speed-gear. Fig. 8 is a perspective view of the primary regulating-valve, and Fig. 9 is a perspective view of the secondary valve.

I/Vhile in the drawings I have shown myV new adjusting mechanism as connected to a speed-gear, yet it is to be understood that I do not confine my present invention to a use in combination with a variable-speed gear, such a combination being adopted vherein mainly for the purpose of more clearly illustrating an important and-valuable relation in which my adjusting mechanism may be used.

Such parts of my variable-speed gear are shown in the drawings as will clearly illustrate the manner ofl applying my present invention thereto. This speed-gear consists, essentially, of a rotary reciprocating pump driven from any suitable external source of' power, arotary reciprocating motor connected to said pump by a Huid and adapted to be operatively connected with a driven device, and means for varying the relative capacities of the pump and motor whereby the speed of the driven device may be varied at will with respect to that of the driving device. I will now indicate, brieiiy, the parts of such aspcedgear, referring to the drawings, in which the same reference characters relate to the same or corresponding parts in all the views.

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The letter l indicates portions ot the fixed f'ramcwork` in which the stationary valve structure E is lixedly mounted. The valve structure is provided with two semicircular ports P and P', consisting' of` cored passages extending thmugh the same and terminating in the inner faces of annular flanges projecting from the central web of' the valve. The ports and constituent passages are separated from each other by narrow bridges or partitions G at diametrically opposite points. A, A', A2, A, A", and A5 are the pump-cylinders, mounted so as to rotate in contact with the valve structure, and each is provided with a port adapted to register successively with the ports P and P of' the valve structure, while similarly disposed on the other side of the said valve structure are rotary motor-cylinders A1 A2, Sac. The pump-cylinder structure is adapted to be connected to a driving device through the medium of' a sprocket S, fixed to the hub of' the rotary-cylinder structure, and in like manner the motor-cylinder structure may be connected by a sprocket Si to a driven device. rPhe motor-cylinder and puimi-cylinder structures are mounted in independent bearings on the fixed f'rame, the letter K indicating the end of' one of' the trunnions of` the motor-cylinder structure, surmounted by a bush L. The crank-pin C, to which the connecting-rods of' the pistons (not shown) in the cylinders A A@ Sac., are connected, is carried by a shaft N, mounted in the eccentric bore of' a bush M, the latter ofl which is concentrically mounted in the trunnion-bearing of' the cylinder structure. A spur-gear Q is fixed to the bush M by a suitable spline g, and a spur-gear T is fixed tothe shaft N by a suitable spline t, and the said gear T meshes with the internal teeth R on the spur-gear O, rotatably mounted on the bush M. The crank-pin U may be caused to move radially toward and through the central axis ofl the device by proper relative motion of the shaf't N and the bush M in opposite directions, such motions being imparted, preferably, through the medium of' the racks W and Y, as hereinafter more particularly7 described, or through any other suitable mechanism, and operated by the adjusting' mechanism. lhe motor-cylinders A A1 A2, Sac., are constructed similarly to the pump-cylinders and have corresponding` ports adapted to register with the ports P and P', and their pistons are connected to a crank-pin one hundred and eighty degrees from the pin C, which pin is carried by a shaf't similar to the shaft N and mounted in a corresponding bush, on the latter of which is fixed a spur-gear Q1, and on the shaft is a gear corresponding to the gear T and meshing with internal teeth on a gear O1, so that adjustment of' the crank-pin of` the motor structure may be eliected in a similar manner to the crank-pin C. The interior space of' the valve and cylinder structures and the passages between the two cylinder structuresare to be supplied with fluid, such as oil or water` providing a fluid connection between the pump and motor, and the operation of' the device as a variable-speed gear will be clearly understood by those skilled in the art. To relieve excess of` fluid in the fluid connection, due to any cause, the relief-chamber (il, Fig. 1, is provided, which chamber is connected to the two ports P and P, resi'iectively, through the medium of the ports s and s'. A piston-val ve V, having heads /t and t', is adapted to reciprocate in said chamber, the movement ofl the valve in either direction being limited by fixed stops a and it. carried by the closing-plugs r and l. lored passages terminating in ports e and e are f'orined in the chamber next to the valve structure E, such ports being so located as to connect the ports P and P through the passages s and s with the port f, which communicates through a suitable passage with the central space ofA the structure or reservoir, such connections being established by the movement ofl the valve V when excess fluid-pressure on either end of' the valve causes it to move. The valve, it will be observed, normally closes the pressure or delivery port P of' the valve E f'rom the central space or reservoir, since it cuts ofi' communication between the port f and the port P, and it therefore normally opens said space or reservoir to the suction-port P'. These parts are all identical in construction and mode of operation with the construction disclosed in my prior application and need not be further described except to note the f'act that the chambers on opposite sides ofl the valve V are connected to pipes Q7 and 27, which afford communication through the relief-chamber between the ports P and P' and my adjusting mechanism now to be described. I may also note that instead of' the wormgearing in my priorconstruction f'or effecting movement of' the gears which actuate the shafts and bushes for adjustment of the crankpins to vary the speed l here use two racks lV and Y, as particularly described hereinaf'ter. l/Vith this brief' description of the essential parts of the speed-gear the application ofl my present invention thereto will be clearly understood and in the f`orm in which I have embodied the invention in the present instance.

The numeral 10 indicates the cylinder of' a fluid-pressure motor; 11, a piston adapted to operate in said cylinder; 1Q, the piston-rod; 13 and 13, the heads Vfor the motor-cylinder; 14, a cylindrical casing mounted on the side ot' the motor-cylinder with its bore at right angles to the bore of' the motor-cylinder and communicating therewith through passages 15 and 15/ Mounted in the interior of the cylindrical casing 14 is a hollow cylindrical secondary valve 16, in one end ofI which is a head 17,

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having a stem or boss to which a rod 18 is fastened. Secured to the rod 18 is a lever' 19, adapted to impart a vibratory or oscillatory motion to the secondary valve 16 in the casing` 14, while the other end of the lever 19 is so connected to the piston-rod 12 by the connecting-rod 2O and the pin 21 that the movements of the piston back and forth in its cylinder will cause the secondary valve 16 to be correspondingly rotated in the casing 14, such movements being simultaneous and synchronous. Mounted in the bore of the secondary valve 16 is a primary controlling-valve 22, containing the four sector cylindrical chambers 23, 23', 23", 23"', formed by the webs 22', two of which, 23 and 23", are open to one end of the casing 14-in the instance shown, left-hand end-and the other two, 23' and 23"', are open to the other end of the casing 14.

Extending from one end of the valve 22 is av stem or boss to which a rod 24 is fastened, while the other end of the rod is provided with a controlling-lever 25, the latter of which is placed within convenient reach of the operator or connected to suitable operating' means located at a distance, if desired. The two heads 26 and 26' close the ends of the cylindrical casing 14, while connected to these heads are the two fluid-circuit pipes 27 and 27', which connect the interior of the casing 14 with the two sides of the fluid-circuit, such connection in the instance shown being through the relief-chamber CZ and the ports s and s' and their connecting passages. The head of the secondary valve 16 has passages 28 cut through it to allow the passage of fluid. From the inner side of the head of the secondary valve 16 pins 29 and 29" eXten'd through the holes 30 and 30" into the sector cylindrical chambers 23 and 23" of the primary valve 22, these pins for reasons hereinafter pointed out being' smaller than the holes in said valve through which they pass. The other two holes 30' and 30"' allow communication between the other two sector cylindrical chambers 23' and 23"' of the valve 22 and their end of the casing 14. The channels 32 and 32' are formed as separate recesses in the outer surface of the valve 16.

Extending from one end of the piston-rod 12 are two racks TW and Y, lying in different planes, rigidly connected together and meshing with their respective spur-gears O and Q and so placed with respect to their spur-gears that a rectilinear motion of the piston-rod 12 causes the two gears O and Q to turn in opposite directions. The rat-io of the diameter of the spur-gear O to the diameter of the spurgear Q is made equal to the ratio of the diameter of the internal gear R to the diameter of the spur-gear T.

The operation of the device is as follows: Suppose the pump-cylinders of the speedgear to be driven by some outside source of power in the direction of the arrow, Fig. 1,

and all the other parts to be in the positions shown in Figs. 1, 2, and 3, where the piston of the adjusting-motor is at its mid-position and the primary and secondary valves at their mid or zero position and all the spaces in the adjusting-motor cylinder 10, the cylindrical casing 14, and the primary and secondary valves 22 and 16, respectively, are filled with fluid,a suitable supply of iiuid under pressure, here shown as the pressure side of the fiuidcircuit of the speed-gear, being' connected to the pipe 27, while the pipe 27' is connected to the exhaust or suction side of the iiuidcircuit. lith the parts in the positions assumed suppose now that the primary controlling-valve 22 is given a slight rotary displacement-say in a clockwise direction, as viewed in Fig. 2-the ports 31 and 31' in the secondary valve will be partially uncovered, and fluid under pressure will then pass from the pipe 27 through the holes 28 in the head of the secondary valve, thence through theholes 30 and 30" into the chambers 23 and 23" of the primary valve, thence from the chamber 23 through the port 31, the channel 32, the passage 15, and into the outer end of the motor-cylinder 10. At the same time that communication is established between the pressure-supply pipe 27 and the outer end of the cylinder 10 by the clockwise rotation of the valve 22 the pipe 27', now acting as the eX- haust,is put into communication with the inner end of the motor-cylinder 10, since the uncovering' of the port 31' in the secondary valve establishes communication between the chamber 23"' and the channel 32', and iuid can then pass from the inner end of the motorcylinder through the passage 15', the channel 32', the port 31', the chamber 23"', the hole 30"' in the end of the valve 22, and from thence through the clearance in the end of the chamber' 14 into the exhaust-pipe 27' and back to the fiuid-circuit of the speed-gear. The Huid under pressure then reaching the outer or left-hand end of the cylinder 10 acts against the piston and forces it toward the other or right-hand end of the cylinder; but at the same time that the piston moves the connecting-rod 20 acts on the lever 19, which rotates the secondary valve 16 in a clockwise direction, and the fluid-pressure continues to pass to the outer end of the cylinder 10 and to force the piston 11 toward the other end and the fluid out of the inner end of theA cylinder 10 until the secondary valve 16 has been rotated in a clockwise direction equal in amount to that given to the primary controlling-valve 22, at which time the ports 31 and 31' are again covered by the primary valve 22, and no fluid can then pass to o1' from either side of the piston of the motor. Similarly, the piston of the motor will move to the other or left-hand end of the cylinder if the primary valve is given a slight rotation in a counter-clockwise direction and its movement IOO IIO

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in this direction will cease when the secondary valve has been thereby rotated in a counter-clockwise direction equal in amount to the rotation of the primary controllingvalve within the limits of the device. If the motor-piston should pass beyond its proper position, it will carry the secondary valve also beyond its proper position, and then immediately the tiuid under pressure will pass to the opposite side of the motor-cylinder and send the piston and the secondary valve back to their positions corresponding` with the position of the primary controlling-valve. rl"he pins 29 and 2 9, extending from the inside otl the head of the secondary valve into the holes 30 and 30 in the primary valve, serve two purposes: lirst, to prevent too-rapid adjustments of the primary controlling-valve, and, second, should the supply ot' Huid under pressure at any time fail it would still be possible to move the piston back and forth in the motor-cylinder by rotating' the primary valve 22 until the pins 29 and 29/ in the head of the secondary valve 16 engage the sides of the holes 30 and 30" in the primary valve, when a further movement of the primary controlling-valve 22 in the same direction, by such means as a lever 25, connected to it through the rod 24C, to which it is secured, would cause the secondary valve to be forced in the same direction, and the secondary valve, by its connection with the piston ot' the motor through the rod 18, the lever 19, connecting-rod 20,.pin 21, and the piston-rod 12, would force the piston to a position corresponding` with that oil the primary controlling-valve less the amount ot' rotation necessary to give to the primary valve in order to make the holes 8O and 30 bear against the sides of the pins 29 and 29". Then the piston of the motor-cylinder 10 moves toward the inner end, due to a clockwise rotation of the primary valve, the rack vW causes the gear 0 to also rotate in a clockwise direction, and the internal gear R meshing with the spur-gear T causes the shaft N, to which it is fastened, to also turn in a clockwise direction, while at the same time the rack Y meshing with the gear Q causes the bush M, to which it is fastened, to rotate in a counterclockwise direction, thus causing a proportional adjustment of the crank C of the hspeedgear. l

It will be clearly seen that with my invention when the ad justing-motor is supplied with a practicallynon-compressible iiuid the piston and consequently all the parts to which it is connected are locked against any extraneous force tending to change their adjustment, since with the cylinder and all of the passages filled with the fluid and the primary valve covering the ports of the secondary valve it is impossible Vfor the piston to 'force liuid from either end of the adjusting-motor cylinder. It will furthermore be seen that when the crank of the pump of the speed-gear is at its zero or concentric position, at which point the pump ceases to furnish fluid under pressure, if the primary valve be moved until the holes 30 and 30'/ bear against the pins 29 and 29" in the head of the secondary valve the crank of the pump of the speed-gear will be moved from its zero position by a further movement of the primary or controlling valve, since such a further movement would cause the secondary valve 16 to move, which in turn would impart movement to the piston-rod 12 through the lever 19, the connecting-rod 20, and the pin 21, and thus cause the racks WV and Y to turn the gears O and Q, and thereby adjust the crank. It will be further seen that the valve mechanism comprises two members, one of which is controllable at will and the other operates synchronously with the movable element of the motor, such as the piston, and that movement of the former member causes admission of uuid-pressure to one side of the piston or movable element, while the latter member is operated by the piston or movable element to close said admission, thereby causing the movement of the piston to correspond with the movement oi the first member. It will also be readily seen that when that portion of the adjusting mechanism which comprises cylinder 10 and the valve mechanism is placed in such a position with relation to the plane oi' racks W' Y that the controllinglever 25 hangs in a vertical position, as in Fig. 3, it being apparent that such position may be obtained by rotating arm 21, the cylinder, Sac., ninety degrees about rod 12, the said lever may be utilized to act as a controlling-pendulum, whereby any inclination of the device from normal position due to any cause whatever may cause the lever 25 under the iniiuence of gravity to operate the controlling-valve 22, the movements of which in turn may cause the piston of the adjustingmotor to automatically effect suitable adjustments of the mechanism on which said motor acts.

It is of course understood that all joints, stuiing-boxes, etc., are to be packed in the usual manner, well known to those skilled in the art.

It is evident that while I have defined the primary valve as controlling the passage of Huid through the secondary valve and the primary valve as controllable at will such mode of operation may be reversed, and hence the terms Lsecondary and "primary7 as applied to the two valves are to be taken as relative terms, definitive rather of the mode of operation of the two coacting valves and not as to their relative positions.

I claim as my invention- 1. The combination with a variable-speed gear consisting of a pump and a motor, of a secondary Huid-pressure motor and connections between said motor and variable-speed IOO IIO

gear, whereby the speed-gear may be adjusted for different speeds,substantially as described.

2. The combination with a Huid-pressureoperated variable-speed gear consisting of a pump and a motor, of a secondary Huid-pressure motor and connections between said secondary motor and variable-speed g'ear, whereby the speed-gear may be adjusted for ditferent speeds, substantially as described. l

3. The combination with a variable-speed gear consisting of a pump and a motor and having' an element capable of being' adjusted for different speeds, of a secondary fluid-pressureactuated motor and means interposed between the secondary motor and the said element whereby the motor may acty throug'h said interposed means to vary the relative position oi' the elements for diiierent speeds, substantially as described.

si. The combination with a variable-speed gear consisting' oi' a pump and a motor and having' an element capable of being adjusted for different speeds, of a secondary iiuidl pressure-actuated motor having its movable element connected to the adjustable element of the speed-gear, a fiuid-pressure lsupply and exhaust for said secondary motor, valve mechanism controlling admission and exhaust of motor iiuid, and means controllable at will for actuating the valve mechanism, one element of which operates synchronously with the movable element of the motor, substantially as described.

5. The combination with a variable-speed gear consisting of a pump and a motor and having an element capable of adjustment i'or varying the speed, of a secondary motor-cyl- `inder having a piston therein, connections between said piston and the adjustable element of said speed-g'ear, a Huid-pressure supply and exhaust `for the motor, valve mechanism controlling said supply and exhaust consisting of two members, one controllable at will and the other operating synchronously with the piston oi' the motor, whereby movement of the former causes admission of fluid-pressure to either side of the piston and the latter operates to close said supply when the piston has moved to a position determined by the position of the former, substantially as described.

6. The combination with a variable-speed gear consisting' of a pump and a motor and having an element capable of adjustment for varying the speed, of a secondary motor-cylinder having' a piston therein, connections between said piston and the adjustable element of the speed-gear, a fluid-pressure supply and exhaust for said secondary motor, valve mechanism controlling the same, comprising a primary member adjustable at will and a secondary member connected to the piston and operating synchronously therewith, whereby adjustment of the primary member to any position for admission oi' fluidpressure to either side of the piston eifects a corresponding movement of the piston, substantially as described.

7. The combination with a variable-speed gear consisting of a pump and a motor adapted Vto be driven by said'pump, a closed fluid-circuit between the pump and motor, said gear having' an element capable of adjustment for varying the speed, of a secondary motor-cylinder communicating with the pressure and suction sides of the speed-gear, a piston in said cylinder having its rod connected to the adjustable element, a valve-casing on the cylinder communicating with each end thereof and through which the fluid passes from and to the speed-gear,a primary valve in said chamber or casing movable at will, a secondary valve in said casing controlling the passage of fluid between the motor-cylinder and the speedgear, and connections between the secondary valve and the piston-rod, substantially as described.

8. The combination with a speed-gear consisting' of a pump and a motor and having an element capable oi' and requiring adjustment, of a secondary fluid-pressure motor-cylinder, a piston movable therein and connected to the adjustable element, a valve-casing on said cylinder communicating with each side oi' the piston and with a uuid-pressure supply, a rotary valve having its interior in communication with the valve-casing and ports for establishing communication between the same and the motor-cylinder, connections between the piston and said valve, a rotary valve operating within the first Valve and normally closing its ports, and controllable at will, substantially as described.

9. The combination with a variable-speed gear consisting of a pump and a motor, of a motor cylinder and piston in a duid-pressureadjusting mechanism, a valve-casing communicating with the cylinder at each side of the piston and with a source of duid-pressure supply, a rotary valve mounted within and communicating with said casing and connected to and moving with thc piston, ports in the valve for establishing communication between its interior and the cylinder, a second rotary valve "within the lirst valve controlling the passage of fluid from the casing through the ports of the said tirst valve, and a locking device between the two valves adapted to establish a positive connection between them, so that movement of the second valve may impart positive movement to the iirst valve, substantially as described.

10. The combination with the motor cylinder and piston in a iiuid-pressure-adjusting mechanism, of a valve-casing' communicating with the cylinder at each side of the piston and with a source oi' iiuid-pressure supply, a secondary valve connected to and moving with the piston and having ports controlling the passage of fluid from the casing' to the cylinder, a primary valve normally closing said IOO IIO

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ports, and a normally inactive positive connection between the two valves, substantially as described.

l1. The combination with the motor cylinder and pistonfotl a lluidpressure-adjusting mechanism, oi a valve-casingv communicating with the c vlinder at each side ot the piston and with a source of fluid-pressure supply, a secondary valve connected to and moving' with the piston and having ports controlling the passage otA tluid from the casing to the cylinder, a primary valve normally closing said ports, and a lixed part carried by the secondary 'alve normally out ot' engagement" with but adapted to engage with the primary valve, whereby movement imparted to either valve may be transmitted to the other, substantially as and tor the purpose described.

l2. rlhe combination with the motor cylinder and pist-on in a lrluid-pressurc-adjusting mechanism, ol" a valve-casing communicating' with the cylinder on opposite sides ot' the piston and with a source of [luid-pressure su pply, a secondary rotary valve communicating' with the casing and having ports adapted to establish communication between the casing and the cylinder, connections between the said valve and the piston, whereby the valve is moved synchronously with the piston, a primary rotary valve mounted within the secondary valve and controlling the ports in the secondary valve, said valve having chambers in communication with opposite ends of the casing, and a fixed part carried by one ot the valves normally out ot engagement with but adapted to engage the other valve, and means for moving the primary valve at will, whereby communication may bc established through the ports ot' the secondary valve between the casing and the cylinder, substantially as described.

13. The combination with the cylinder and piston of a fluid-pressure-adjusting motor, of a casing in communication with each end ot' the cylinder and with a source ot iiuid-pressure supply, a secondaryrotary valve in said casing having its interior in communication with each end ot' the casing, fluid-passages on its outer side adapted to connect with the opposite ends oi: the cylinder, ports connecting' said passag'es with the interior ot' said valve, a primary rotary valve mounted within the secondary valve and communicating with each end ot' the casing and normally closing the ports in the secondary valve, and oppositelydisposed cham bers in said primary valve communicating with the ends ot' the valve-casing', and a lixed part carried by one ot' the valves normally out ot' engagement with but adapted to engage the other valve, connections between the piston of the motor and the secondary valve, and means for actuating the primary valve, substantially as described.

let. The combination with a variable-speed gear having a relatively fixed element capable ot' adjustment, and spur-gears forming' an element ot' the adjusting mechanism thereof, of a cylinder connected with a source of ii uidpressure supply having' a piston therein, a yoke-rack connected to said piston, one set ot teeth thereon engaging one spur-gear and the other set the other spur-gear to cause them to rotate in opposite directions, a valve mechanism comprising primary and secondary members for controlling the admission and exhaust ot' the cylinder, connections between the secondary valve and the piston, and means for operating the primary valve, substantially as described.

15. The combination with a mechanism having relatively tiXed elements capable ot' and requiring adjustment, spur-gears forming elements in the adjusting means of said mechanism, o t' a yoke-rack havin g op positely-disposed teeth engaging the gears to cause them to rotate in opposite directions, a motor-cylinder having a piston therein, a valve-casing communicating with a source ot fluid-pressure supply and with the cylinder von opposite sides ot' the piston, a secondary valve in said casing and having' ports therein adapted to control the passage ol tluid to and from the cylinder, and a primaryyalve mounted within the secondary valve and controlling the passage of i'luid from the casing through the secondary valve-ports, connections between the secondary valve and the piston, and means tor operating the primary valve, substantially as described.

1G. The combination with a fluid-actuated variable-speed gear provided with a pump, of a fluid-pressure motor actuated by the fluidpressure generated in the speed-gear, and connections between said motor and speed-gear, whereby the speed-gear may be adjusted for different speeds, substantially as described.

17. The combination with a Huid-actuated varial lespeed gear having' an element capable ot adjustment, ot a Huid-pressure motor,

valve mechanism interposed between the speed-gear and motor and controlling [inidpressure between the speed-gear and the motor, one element of which valve mechanism is controllable at will and the other by the motor, and connections between the motor and the adjustable element o't' the speed-gear, substantially as described.

18. The combination with a 'duid-actuated variable-speed gear having an element capable oiI adjustment, ot' a fluid-pressure motor deriving' its fluid-pressure 'from the speedgear, valve mechanism interposed between the speed-gear and the motor for controlling the flow otl l'luid between the two, said valve mechanism comprising a primary valve controllable at will, and a secondary valve having positive connections with the motor and arranged to cut otf the supply of fluid-pressure from the speed-gear to the motor and stop the motor in a position determined by TOO lIO

the position of the primary valve, and a connection between the motor and the adjustable element oi the speed-gear, substantially as described.

19. The combination with a variable-speed gear consisting of a pump and a motor adapted to be driven by said pump, a closed luid-circuit between the pump and the motor, said gear having an element capable of adjustment for varying the speed, of a secondary fluidpressure motor having a movable element, connections between said movable element and the adjustable element, luid connections between the pressure and suction sides ot' the speed-gear and the secondary motor, valve mechanism between the motor and the speedgear for controlling the passage of liuid through said fluid connect-ions, and means controllable at will for actuating the valve mechanism, one element of which operates synchronously with the movable element of the motor, substantially as described.

20. The combination with a variable-speed gear consisting of a pump and a motor and having an element capable of and requiring adjustment, of a iiuid-pressure-adjusting motor, a connection between said adjustable element and the motor, and means so disposed as to permit the action of gravity to control the movements of the adjusting-motor, substantially as described.

21. The combination with mechanism having an element capable of and requiring adjustment, oi a fiuid-pressure-adjusting motor, a valve mechanism controlling the supply of fluid to Aand from the motor, one element of said valve mechanism controllable at will and free to be moved by the action of gravity when the device is inclined from normal position, and the other element connected to the motor and movable therewith, and a iiXed part carried by one element of said valve mechanism, normally out ot' engagement with but adapted to engage with the other element, substantally as described.

22. The combination with mechanism having an element capable of and requiring adjustment, of auid-pressure-adjusting motor, a connection between the adjustable element of the mechanism and the motor, valve mechanism controlling the supply of iiuid to and from the motor, said valve mechanism comprising a primary valve having a dependent operating-stem normally vertical by which the said valve may be adjusted at will, and a secondary valve connected to and operated by the motor and whose position is determined by the position of the primary valve, and a iiXed part carried by one of the valves, normally out ot engagement with butadapted to engage the other valve, substantially as described.

23. The combination with mechanism having an element capable of and requiring adjustment, of a iuid-pressure-adjusting motor, connection between said motor and the mechanism to be adjusted, a valve mechanism controlling the supply of fluid to and from the motor consisting of a primary rotary valve having an arm normally vertical and adapted to be moved by gravity when the device is inclined from the normal or level position, and a secondary valve controlling the passage of fluid from the primary valve to and from the motor, and connection between the secondary valve and the motor for causing the two to operate synchronously, and a iixed part carried by one of the valves, normally out of engagement with but adapted to engage the other valve, substantially as described.

24. The combination with a variable-speed gear comprising a pump, amotor, and amechanism having an element capable of and requiring adjustment, of a secondary Huid-pressure-adjusting motor, connection between the motor and the said mechanism, a valve mechanism controlling the supply of fluid to and from said motor, one element of said valve mechanism adjustable at will and the other element thereof connected to the said motor and movable therewith, a iiXed part carried by one ot' said elements of the valve mechanism normally out of engagement but adapted to engage with the other element, substantially as described.

In testimony whereoflhave signed my name to this specification in the presence of two subl/Vitnesses:

CHAPMAN WV. FowLnR, M. H. MILns. 

